Oral sleep appliance



FIG. 1 is a front perspective view of the oral sleep appliance.

FIG. 2 is a front elevation view of the invention.

FIG. 3 is a rear elevation view of the invention.

FIG. 4 is a top plan view of the invention.

FIG. 5 is a bottom plan view of the invention.

FIG. 6 is a left side elevation view of the invention; and,

FIG. 7 is a right side elevationview of the invention.

The broken line showing illustrates portions of the article that form no part of the claimed design. 

The ornamental design for a oral sleep appliance, as shown and described. 